Bug Fixes:
----------

- Fix acl_get_* functions in 32-bit Cygwin (pointer sign extension)

- Fix select/poll issue in case a socket connect call fails.
  Addresses: https://cygwin.com/pipermail/cygwin/2020-July/245528.html

- Fix multiple reader support for FIFOs
  Addresses: https://sourceware.org/pipermail/cygwin/2020-July/245456.html

- Fix an mmap issue that could cause failure with errno EFBIG
  Partially addresses: https://sourceware.org/pipermail/cygwin/2020-July/245557.html

- Fix the behavior of C++ apps after an unhandled exception (64-bit only)
  Addresses: https://cygwin.com/pipermail/cygwin/2019-October/242795.html
             https://cygwin.com/pipermail/cygwin/2020-August/245897.html
